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Investment Securities - Investments by Contractual Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Amortized Cost, Available-for-sale securities      
Amortized Cost $ 2,350,864 $ 1,760,668  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains 19,686 22,161  
Gross unrealized loss (9,602) (1,124)  
Fair Value, Available-for-sale securities      
Fair Value 2,360,948 1,781,705  
Yield, Available-for-sale securities      
Yield 1.70% 1.99%  
Amortized Cost, Held-to-maturity securities      
Amortized Cost 1,654,666 1,191,487  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains 3,387 25,736  
Gross unrealized losses (75,204) 0  
Fair Value, Held-to-maturity securities      
Fair Value 1,582,849 1,217,223  
Yield, Held-to-maturity securities      
Without a single maturity date 3.14%    
Yield   3.10%  
Investments 4,005,530 2,952,155  
Gross unrealized gains on investments 23,073 47,897  
Gross unrealized losses on investments (84,806) (1,124)  
Fair value of investments 3,943,797 2,998,928  
Yield on investments 2.30% 2.44%  
Proceeds from available-for-sale securities 43,198 2,257,913 131,361
Gain (loss) on sale of securities 0 95,234 8,147
Term of contractual due dates of substantially all mortgage-backed securities 25 years    
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 190,357    
Obligations of U.S. government
      
Amortized Cost, Available-for-sale securities      
Within 1 year   19,999  
1 to 5 years 61,002 0  
5 to 10 years 129,219 59,300  
Over 10 years 344,571 100,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Within 1 year   42  
Gross unrealized gains, 1 to 5 years 3,393 0  
Gross unrealized gains, 5 to 10 years 0 4,225  
Gross unrealized gains, Over 10 years 0 0  
Gross unrealized losses, Within 1 year   (6)  
Gross unrealized losses, 1 to 5 years (252) 0  
Gross unrealized losses, 5 to 10 years (1,547) 0  
Gross unrealized losses, Over 10 years (2,411) 0  
Fair Value, Available-for-sale securities      
Within 1 year   20,035  
1 to 5 years 64,143 0  
5 to 10 years 127,672 63,525  
Over 10 years 342,160 100,000  
Yield, Available-for-sale securities      
Within 1 year   0.57%  
1 to 5 years 1.98% 0.00%  
5 to 10 years 0.86% 2.21%  
Over 10 years 0.93% 1.05%  
Equity Securities
      
Amortized Cost, Available-for-sale securities      
1 to 5 years 500    
5 to 10 years 100,000    
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, 1 to 5 years 11    
Gross unrealized gains, 5 to 10 years 726    
Gross unrealized losses, 1 to 5 years 0    
Gross unrealized losses, 5 to 10 years 0    
Fair Value, Available-for-sale securities      
1 to 5 years 511    
5 to 10 years 100,726    
Yield, Available-for-sale securities      
1 to 5 years 2.17%    
5 to 10 years 1.80%    
Corporate debt securities
      
Amortized Cost, Available-for-sale securities      
Within 1 year 19,500    
1 to 5 years 317,190 336,340  
5 to 10 years 113,060 62,919  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Within 1 year 3    
Gross unrealized gains, 1 to 5 years 1,980 2,810  
Gross unrealized gains, 5 to 10 years 1,180 1,324  
Gross unrealized losses, Within 1 year 0    
Gross unrealized losses, 1 to 5 years (130) (61)  
Gross unrealized losses, 5 to 10 years (768) (7)  
Fair Value, Available-for-sale securities      
Within 1 year 19,503    
1 to 5 years 319,040 339,089  
5 to 10 years 113,472 64,236  
Yield, Available-for-sale securities      
Within 1 year 0.49%    
1 to 5 years 0.75% 0.91%  
5 to 10 years 1.53% 2.73%  
Yield, Held-to-maturity securities      
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer 9,763    
Municipal Bonds
      
Amortized Cost, Available-for-sale securities      
Over 10 years 20,422 20,442  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Over 10 years 2,123 4,402  
Gross unrealized losses, Over 10 years 0 0  
Fair Value, Available-for-sale securities      
Over 10 years 22,545 24,844  
Yield, Available-for-sale securities      
Over 10 years 6.45% 6.45%  
Amortized Cost, Held-to-maturity securities      
Within 1 year   795  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains, Within 1 year   7  
Gross unrealized losses, Within 1 year       
Fair Value, Held-to-maturity securities      
Within 1 year   802  
Yield, Held-to-maturity securities      
Within 1 year   5.80%  
Agency pass through mortgage-backed securities
      
Amortized Cost, Available-for-sale securities      
Without single maturity date 1,245,400 1,161,668  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Without single maturity date 10,270 9,358  
Gross unrealized losses, Without single maturity date (4,494) (1,050)  
Fair Value, Available-for-sale securities      
Without single maturity date 1,251,176 1,169,976  
Yield, Available-for-sale securities      
Without single maturity date 2.18% 2.28%  
Amortized Cost, Held-to-maturity securities      
Without single maturity date 1,654,666 1,190,692  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains, Without single maturity date 3,387 25,729  
Gross unrealized losses, Without single maturity date (75,204) 0  
Fair Value, Held-to-maturity securities      
Without single maturity date 1,582,849 1,216,421  
Yield, Held-to-maturity securities      
Without a single maturity date 3.14% 3.10%  
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer $ 166,503